What gamo rifle is this?

[efem09]

Found a gamo rifle in a garage box this evening, can't figure this one out.

Looks like a shadow but not sure its a 5.5mm

 

[X27]

The name should be on top of the spring housing.
post a photoclose up top view photo

 

[gamotech00]

Like the other guy said it should be printed on top after the rear sight.